Thanksgiving Turkey Burger

Name: Thanksgiving Turkey Burger
Ingredients: 2 tbsp. butter; 2 large leeks; 2 stalk celery; 2 tsp. finely chopped thyme; 2 tsp. finely chopped sage; 1½ tsp. kosher salt; ¾ tsp. Freshly ground black pepper; 1¾ lb. ground turkey; canola oil; ¼ lb. aged white Cheddar; 4 hamburger rolls; 3 tbsp. mayonnaise; 3 tbsp. spicy brown mustard; ½ c. whole berry cranberry sauce